But when we talk about packet loss and Intermapper we have to remind people that packet loss reported is the result of Intermapper sending out packets and expecting a reply. If it doesn't get one it chalks it up to packet loss.
Packet Loss report by Intermapper is not the result of info returned from SNMP from the remote device. This packet loss is relative to what is happening in the network. If there is network congestion anywhere along the path to/from the device, and especially if there is QoS configured - Intermapper's packets may get outright dropped or dropped in favour of other traffic. However, should this packet loss be counted against the device at the end of the chain? Especially with QoS, is this then "packet loss" or how the network was configured to operate? And just one question as I can't recall reading it anywhere, are the packets that Intermapper sends to measure "packet loss" UDP or TCP? SNMP is UDP and as such is prone to be dropped as it is a connectionless protocol. Even if Intermapper is using TCP, QoS could still knock it out if prioritized applications are taking up the bandwidth. At the moment I have set the threshold to require 100 packets out of 100 to effectively disable this feature. Kevin -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Christopher L. Sweeney Sent: 12-Dec-06 8:50 To: InterMapper Discussion Subject: RE: [IM-Talk] short term packet loss At 8:39 AM -0500 12/12/06, DARBONNE, MARK wrote: >The loss only appears since I have installed the new version. I have >to question its accuracy as I have not made and changes to any of my >lines, yet I get reports of loss across the entire network now. >The loss is not significant as it only appears for seconds and then is gone. InterMapper has reported packet loss for a long time, but it did not cause alarms/warnings/etc. for packet loss in older versions; this feature was added in 4.5. So previously, while it would have reported the number in the status window, it would have been up to you to notice that it was high. This is why you only get alarms, etc., with the new version. -- Christopher -- ================================================ Christopher L. Sweeney Dartware, LLC http://www.dartware.com/ ____________________________________________________________________ List archives: http://www.mail-archive.com/intermapper-talk%40list.dartware.com/ To unsubscribe: send email to: [EMAIL PROTECTED] ____________________________________________________________________ List archives: http://www.mail-archive.com/intermapper-talk%40list.dartware.com/ To unsubscribe: send email to: [EMAIL PROTECTED]
